60 persons consume 300 kg of wheat in 40 days. In how many days will 25 persons consume 100 kg of wheat?

It takes 32 days.

Consumption uses persons x days for the wheat quantity.

60 x 40 = 2400 person-days for 300 kg, so 300/2400 = 0.125 kg per person-day.

For 100 kg with 25 persons: 100 = 25 x D x 0.125.

100 = 3.125 x D, so D = 32 days.